How to find out which package version is loaded in R?


You can use packageVersion to see what version of a package is loaded

> packageVersion("snow")
[1] ‘0.3.9’

Although it sounds like you want to see what version of R you are running, in which case @Justin's sessionInfo suggestion is the way to go


I am in a process of figuring out how to use my university cluster. It has 2 versions of R installed. System wide R 2.11 (Debian 6.0) and R 2.14.2 in non-standard location.

I am trying to use MPI together with snow. The code I am trying to run is the following

cl <- makeMPIcluster(mpi.universe.size()-1)

It works without the problems on R 2.11. (I launch the script with mpirun -H localhost,n1,n2,n3,n4 -n 1 R --slave -f code.R). Now when I try to do it with R 2.14.2, I get the following message:

Error: This is R 2.11.1, package 'snow' needs >= 2.12.1
In addition: Warning message:

So it seems that R loads the package snow version compiled for R 2.11. I've installed snow under R 2.14 into my home folder and I added the following lines to my code:


And the output before the error confirms that I am indeed running R 2.14.2 and my R packages folder is first in search path. But I still get the error.

So my question is how do I determine which version of package is loaded in R? I can see with installed.packages all the packages which are installed, so maybe there is some function which lists similar information for loaded packages?

Use the following code to obtain the version of R packages installed in the system:

installed.packages(fields = c ("Package", "Version"))

Search() can give a more simplified list of the attached packages in a session (i.e., without the detailed info given by sessionInfo())

search {base}- R Documentation
Description: Gives a list of attached packages. Search()

#[1] ".GlobalEnv"        "package:Rfacebook" "package:httpuv"   
#[5] "package:httr"      "package:bindrcpp"  "package:forcats"   # 
#[9] "package:dplyr"     "package:purrr"     "package:readr"     
#[13] "package:tibble"    "package:ggplot2"   "package:tidyverse" 
#[17] "package:stats"     "package:graphics"  "package:grDevices" 
#[21] "package:datasets"  "package:methods"   "Autoloads"         

To check the version of R execute : R --version

Or after you are in the R shell print the contents of version$version.string


To check the version of installed packages do the following.

After loading the library, you can execute sessionInfo ()

But to know the list of all installed packages:

packinfo <- installed.packages(fields = c("Package", "Version"))
packinfo[,c("Package", "Version")]

OR to extract a specific library version, once you have extracted the information using the installed.package function as above just use the name of the package in the first dimension of the matrix.

packinfo["RANN",c("Package", "Version")]
packinfo["graphics",c("Package", "Version")]

The above will print the versions of the RANN library and the graphics library.

GUI solution:

If you are using RStudio then you can check the package version in the Packages pane.